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相关概念视频

Errors in Global Positioning System01:26

Errors in Global Positioning System

112
Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
112
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
148

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相关实验视频

Updated: Sep 11, 2025

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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在Lidar应用程序中改进了用于光学相位阵列芯片相位错误校正的SPGD算法.

Tao Shi, Yu Cheng, Xudong Du

    Applied optics
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    PubMed
    概括
    此摘要是机器生成的。

    改进的算法纠正了光学相位阵列 (OPA) 芯片中的随机相位错误,提高了Lidar系统的光束质量. 这种方法提供了更快的融合和更好的准确性,特别是在复杂的,大通道设计.

    更多相关视频

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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    相关实验视频

    Last Updated: Sep 11, 2025

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    科学领域:

    • 光子学是指光子学中的一个方面.
    • 光学工程是指光学工程.
    • 利达尔技术是利达尔的技术.

    背景情况:

    • 光子光学相位阵列 (OPA) 芯片中的随机相位错误会降低输出光束质量.
    • 有效的相位错误校正对于基于OPA的激光雷达系统至关重要.

    研究的目的:

    • 引入和评估一个改进的适应性随机并行梯度下降 (ASPGD) 算法用于OPA随机相位错误校正.
    • 为了证明算法的有效性,特别是在大频道数 OPA 设计中.

    主要方法:

    • 开发和实施一个增强的ASPGD算法.
    • 使用制造的16通道光子OPA芯片进行实验验证.
    • 与传统的随机平行梯度下降 (SPGD) 和遗传算法进行比较分析.

    主要成果:

    • 在16通道芯片上成功演示了ASPGD用于OPA相位错误校准.
    • 与SPGD和遗传算法相比,ASPGD表现出明显更快的趋同.
    • 用ASPGD实现了更高的纠正光束形状的共弦相似度值,特别是对于增加的通道数量.

    结论:

    • 改进的ASPGD算法为OPA芯片提供了高效和准确的相位错误校正.
    • 这种算法在OPA设计中显示了对大型通道数量传统方法的卓越性能.
    • 这项工作有助于OPA技术在芯片规模,远程Lidar应用中的实际部署.